With Clean on Demand Controllers the “On-Time” setting must be set correctly or else bag cleaning will suffer. On on Turbo baghouse controllers (and on many others) you need to first find the preset that corresponds to the on-time setting (here shown as F1), push select, and then enter the proper value (.1-.15 ms)

Question: What does the “On-Time” setting on my baghouse control board do?

Answer: On-Time determines how long the pulse valve is open for during a cleaning cycle. This setting is VERY important for proper cleaning of the baghouse filters on a pulse jet dust collector. If set too long then the air pulses will be weak and waste compressed air, lower pressure in the air header (causing delays while it builds back up or weakening the following pulses) or even damage the filters. If set too short not enough air volume will be released to clean the entire bag. It will also cause uneven dust loading on the bags, which in turn can cause a long list of problems in the collector.

Question: What should I set as the “On-Time” on my baghouse control board?

Answer: As a general rule, this should be set to between .01 – .015 ms (milliseconds). For certain specific applications (such as pleated filters, or certain “sticky” dusts) your dust collector OEM might provide you with a slightly different setting.

Question: What is clean-on-demand and why should I use it instead of just setting a timer?

Using a clean on demand baghouse controller, operators set high and low differential pressure points (usually 5.5″ and 3″ respectively). When the DP reading hits the high point the control board begins firing the pulse valve(s). It will continue firing them in order until the DP drops below the low point.

In contrast to a simple timer board, a clean on demand controller only cleans the bags only when necessary to maintain stable operation. This prevents over cleaning (which increases wear and produces higher emissions), reduces compressed air use (costly in most plants), and reduces wear on the diaphragm valves. Additionally, clean on demand controllers are able to adapt to changes in dust loads (common in most applications) something timers cannot do.

Now in my plant they use time cycle to control the bag filter and now they want use dp to control the bag filter, anyone have idea how the dp actually function in controlling the purging and the sequence.

The clean on demand controllers use a high and a low point to trigger the cleaning sequence and then to shut it off. this means the unit will only clean when the DP is high (effectively only cleaning the bags when they are dirty). The controllers are very easy to program and install. For more information you can contact us via the contact form and we will be happy to explain it in greater detail and get you a quote on a controller for your unit.